Drill chuck



- J ne 30, 1931.

F. W. SPENQER I DRILL CHUCK Filed June 21. 1929 Patented June 30,1931 v l menmmxf on cameo, I'Ln n'ors This invention-relates 'to tools and more particularly to a chuck adapted [to 'be'use in' connection withla brace'and by means of which a bit having either a: round o'r a squared shank may be firmlyheld.

a chuck whieh maybe engaged in the bitreceiving socket of a braoe of an 'or'dmary construction and so constructed that a bit I 10 or drill having a shank of either a round I or squared construction very firmly held I 5 may accommodate themse ter' of the shank v shank:

caused to rotate properly when in use;

- Another object of'the-invention is to provide the chuck withbit-en aging j aws which and firmly gripeither a thick or thinfbit Ano her object ofthe invention "is to pro- I 2o videfa bit-holding chuck having. actuating means for its bit-enga'gingjaws which may be very easily movedrto' adjust the jaws and 7 will firmly hold the jaws in an adjusted positionfl lVhi-le it is stated that the chuck is 1 2 for use in connection with a bit, it will be understood that it could alsofbe applied ,to r a lathe in order to connect a drill or similar toolwiththe rotatin spindle of the lathe;

"The invention is illustrated inthe accom- 3 panying drawings, wherein Figure 1 is a perspective view of the improved chuck, v; V j

Fig. 2 is a transverse sectional [v ew I through the chuck,

Fig.2,and" i V 3 Fig. 4 is'a transverse sectional view taken on the line 4-4; of Fig. 3.

14 free endv and is vformed with flat side faces so that it' may be fitted into the socket 4 of The casing 1 orbody'portion of the chuck has its 'forward portion- 2 of an even diameter and externally threaded and this casing preferably-tapers 'rearw'ardly and merges into a shank 3 whichv tapers toward its abraceor lathe spindle andjcaused to rotate with the socket; Aneck 5 is formed in the inner end portion of thebodyor casing l at itsrjunction with theshank 3,'and this neck disposed, in

' One object of the invention is to provide ves to thediamej of abit fitted into the chuck F ig. 13 s a long tudinal sectional view through the chuck taken on the line 3'3 of 29-" l 3f, 7? e9s 'n is provided with bayonet slots 6 preferably 1 opposed relation to'each other, I and adapted to receive pins 7 ipr'o ectingfrom a socket 8.'-By this arrangement the socket may: be removably secured in the easing andfirmly held when in place.

Thisisocket' lhas theinner faces ofits walls cut,

as shown inFig. 4, to form'teeth 9 which.

extend longitudinally of thesocket and these teeth are adapted'tto bear against flat. faces fee of a bit shank near the rear end thereof or bite" into a circular bit shank and thereby cause the'rear end of the shank to be firmly against rotation in the gripped and held socket. I

externally the casing" andthis head: is

be passed'through it. {Arlllg 13 fits: against "the outer; face of the-'headfand; from-{this ringextend pinsl upon. which. are pivotally mounted jaws lewhich extend-inwardly v I towards theopening l2 and terminate ineni .5; 'largedheadshavirigf-slotslGformed therein 1 through which pass pins 17 carried-by the head .10. Springs 18 urge the free ends of the jaws toward eachother and these free the ring-13,?and i'norderfto rotate 'thisring,

ends, are serratedto for'm teethso thatx'the Y jaws may firmly grip abit'shank passedbetween, the jaws'and inwardly throughj the 1 j V opening 12 into thelcasing. 2

The jaws are moved about their pivots to w ward and away from each other by rotating I there has been provided apin '19 which ex tends I outwardly therefrom and passes T607 throughlan opening formed in a" cap 20 V which fitsabout the head and outer end of 1 the casing and has-its'a'nnularwall 21 formed with ici'rcumferentially' extending slots "22, through -which pass screws 23 servingto retain the cap in place andlimit -rotary I movementthereof; .IBy-grasping the leap l I and rotating' it the ring will {be [rotated with it andas'the ring moves the jaws will be swung jei her'f toward or away'from each lee,

other according to the direction in which the cap is turned. Therefore, the jaws may be very easily swung into position to firmly grip the shank of a bit or move out of en gagement with it and there will be no danger of the jaws not properly gripping the bit shank as they cannot move toward a releasing position until the cap is turned. An opening 24 is formed centrally in the cap opposite the opening 12 so that the shank of a bit may be passed through the cap and head into the casing. If it is found that the rear end of a circular bit shank cannot be properiy engaged in the socket 8, the head and cap can be detached from the easing and the socket removed, thereby allowing the rear end of the bit shank to be directly received in the neck 5 or if no essary thrust into the hollow neck 3.

I have, therefore, provided chuck adapted to receive a bit having either a rouno or square shank and by means of which the bit may be very firmly held and prevented from turning in the chuck.

Having thus described the invention, I claim:

1, A chuck comprising a hollow body, a shank extending rearwardly from said body, a seat in said body to receive the rear end of a bit, a head for the front end of said body formed with a central opening, a ring fitting against said head, aws pivoted to said ring and extending towards said opening and pivotally and slidably connected with said head for movement towards and away from the opening as the ring is rotated, means between the ring and opening to guide movement of the jaws, and means to rotate said ring.

2. A chuck comprising a hollow body, a shank extending rearwardly from said body, a head for the front end of said body formed with a central opening a ring fitting against said head and rotatable circumferentially thereof, the ring being disposed about the opening in spaced concentric relation thereto, jaws pivotec to said ring and extending towards said opening and having their free end portions formed with transverse slots, pins extending from said head between the ring and opening and engaged through the slots of the aws to guide movement thereof towards and away from the opening as the ring is rotated, resilient means urging said jaws towards the opening, and means to rotate said ring.

3. A chuck comprising a hollow body, a shank extending rearwardly from said body, a seat in said body to receive the rear end of a bit, a head for the front end of said body formed with a central opening, a ring fitting against said head and rotatable circumferentially thereof, jaws pivoted to said ring and extending towards said opening and pivotally and slidably connected with said head between the ring and opening for movement towards and away from the opening as the ring is rotated, a cap covering said ring and jaws and rotatable about the body, means to limit rotary motion of the cap, and a pin ex tending from said ring through said cap to cause the ring, to be rotated and adjust the jaws when the cap is turned.

i. A chuck comprising a hollow body, a shank extending rearwardly from said body, a head for the front end'of said body formed with a central opening and having an annular wall fitting about the body, a ring fitting against the outer face of said head and rotatable, jaws pivoted to said ring and extending towards the opening and pivotally and slidably connected with the head, a cap covering the head and having an annular fitting about the wall of the head and formed with a circum-ferentially extending slot, a fastener passed through the slot and wall of said head into said body to retain the head in place and limit turning of the cap, and a pin extending from said ring through said cap whereby the ring will be turned with the cap and the jaws moved into and out of position to grip a bit passed through the cap and head into the body. 7

In testimony whereof I aflix my signature;

FREDERICK W. SPENCER [L. s.] 

